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Math Help - Probability Question using Inclusion-Exclusion Formula.

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    Probability Question using Inclusion-Exclusion Formula.

    X people go to a party leaving hars at the door. When they leave they take a hat at random. What is the probability that no-one gets the correct hat?
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    Quote Originally Posted by bluebiro View Post
    X people go to a party leaving hars at the door. When they leave they take a hat at random. What is the probability that no-one gets the correct hat?
    Study this thread. It is the same question in different terms.
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